Custom Post Variables

I have updated my PostView to include my Google Authorship tags, so as expected they show up on every blog post. However, I would like to only include these tags on specific posts, namely long, in-depth posts versus short posts regarding things like site
updates. What would be the best way to do this?

Ideally, there would be a flag I could set when posting to indicate this, but some other options I've considered are: